Facing tool for gasket seats



Jan. 19' 1926. 1,570,042

s. s. LAY

name Toor. rdn mslm' sans Filed Nov. 19. 1923 Patented Jan. 19, 1926.

UNITED STATES PATENT OFFICE.

SAMUEL B. CLAY, OF ST. LOUIS, MISSOURI, ASSIGNOR TO KEINE BOILER COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

FACING TOOL FOR GASKET SEATS.

Application led November 19, 1923. Serial No. 675,777.

To azZZ wzomiz'z may concern:

Be it known that I, SAMUEL B. CLAY, a citizen of the United States, residing at St. Louis, Missouri, hve invented a cert-ain new and useful Improvement in Fac-ing Tools for Gasket Seats, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to cutting tools of the kind that are used for forming a circular, fiat surface on a membervsurrounding a hole in the member.

The main object of my invention is to provide an efficient tool of simple design for forming or facing off the hand hole cover gasket seats or tube seats on the inner side of a header or water 'box of a water tube boiler.

Another object is to provide a tool of the kind referred to which is of such design that it can be inserted in a boiler header or water box through a hand hole in the front side of same and thereafter operated manually by a workman located on the outside of the boiler to face off or dress down the gasket seat surrounding the hole through which the tool is inserted. Other objects and desirable features of my invention will be hereinafter pointed out.

Figure 1 of the drawings is a view illustrating the method of using my improved tool in the field to face oft or dress down the hand hole cover gasket seats on the inner side of a header or water box to which boiler tubes are connected.

Figure 2 is an end view of said tool, partly broken away, to show how the cutters are pivotally mounted in the head of the tool.

Figure 3 is a perspective view of the end piece of the head of the tool; and

Figure 4 is a view, illustrating the method of using my improved tool in the factory to form hand hole cover gasket seats or tube lseats on the inner side of a sectional boiler header.

Referring to the drawings whichV illustrate the preferred form of my invention, A designates the shank of my improved tool, B designates a head carried by said shank -and C designates cutters pivotally mounted in said head in such a way that rotary movement of the head in one direction causes the cutters to swing outwardly into a position where the outer end portions o f same project radially beyond the perlphery of the head, and rotary movement of said head inthe opposite direction causes the cutters to swing inwardly into a position where the outer end portions of same are housed within the head. The head B of the tool is of substantially the same diameter as the hand holes in the front wall of a sectional boiler header o-r water boX so as to enable said head to be inserted through a hand hole when the cutters C are collapsed or housed within the head. After the head of the tool has been inserted in the hand hole the shank A of the tool is rotated ina direction to expand the cutters or cause them to swing outwardly into such a position that the cutting edges of same will act on the inner side of the hollow member into which the head of the tool projects. Thereafter, when the shank of the tool is rotated in the opposite direction, the cutters C will collapse, thus permitting the head of the tool to be withdrawn from said hollow member.

The head B can be constructed in various ways without departing from the spirit of my invention as expressed by the scope of the claims and said head can be provided with any desired number of cutters. In the tool herein shown the head B is composed of a stationary part l carried by the shank A of the tool, and ahremovable end piece 2 that is retained in position by a plurality of fastening devices 3 extending through the end piece 2 and screwed into the stationary part l of the head. The end piece 2 and stationary part l are cut away so as to form a pocket or space in the head in which the cutters C are arranged in such a manner that the outer end portions of said cutters can move inwardly and outwardly with respect to the outer surface or periphery of the head B of the tool. Preferably, the inner ends of the cutters C are pivotally mounted on pins 4 that project into holes 5 formed in the stationary part l and end piece 2 of the head. The outward movement of said cutters is limited by shoulders 6 on the head against which the rear sides of the cutters C bear, during the cutting operation, and the inward movement of said cutters is limited by shoulders 7 on the head against which the front sides of said cutters strike when the head is re rolved in a direction to collapse the Cutters or Cause theni to swing inwardly into the position shown in broken lines in Figure 2. It desired, the head B oit the tool can be provided with resilient builers mounted in the head in sueh a way that the]v will bear against the iront sides ot the cutters C when said cutters are retracted or eollapsed, and thus tend to throw the cutters outwardly as soon as the head is revolred in a direction to expand the. Cutters. Each oi the cutters C is provided with two parallel cutting ef' s 9 and lll disposed at subsantially "'gnz angles to the longitudiinil axis ot the shank A ot the tool.

Villien the tool to be useil in the held to dress down or tace ott the hand hole cover gasket seats ot a boiler the cutting edges f) oi. the Cutters C are used, and when the tool is used in the :taetory to torni, dress down or face oil the hand hole @over gasket seats or tube seats on the inner side oit a sectional .ii-einlei-E bei'ore said header is eenibined with the water tubes oit a` boiler, the eutting edges l0 of the Cutters are used. l Figure l ol 'the drawings l hare illustrat ed the method ol using the tool in the field, the relerenee character ai designating the tubes ot a boiler, the reference character i/ designating a header 01 r-:ater box to which said tubes are connected, the reference eharaeter ,e designating one ol the hand holes in the front side ot said header or water bm: and the reference oharaoter u1 designating a hand hole cover gasket seat on the inner side of said wall surrounding the hand hole To tace oli1 or dress down said hand hole cover gasket seat fw, the operator inserts the head l ot the tool through the hand hole and then turns the head ot the tool in a direction to cause the Cutters C to swing` outivardl7 into their extended position. as shown in Figure l. '.l`hereat'ter the olii-rater mores a yoke-shaped bearing nicrnber D looselyv mounted on the shanl A oithe tool longitiulinall)y ol the shanl into engagement with the liront side ot the vall in which the hand hole is formed, thus causing the cutting edges f) ot the eutters l to be drawn into engagement `with the hand hole cover gasket seat w on the inner side oi said wall. rollar lil that is rotambi)v mounted on a irrew-tlireaded portion il on the shank Ji. oli the (aitter is 'then turned in a direction to canse it to engage the bearing ineniber and retain said bearing nieniber and the cutters (l in engagenient with the 'iront wall olf the hollow ineniber into which the head of the tool projerls. said collar E being retained in adjusted position by tightening a set serow l on raid collar. rlherealter the shank il of the tool is rerolvcd in a direction to cause the cutting edges 9 ot the cutters to aet on the gasket seat 'ai and dress down or tace oli' said seat, the shank A ot the tool heilig prorided with a plurality oit right-angular ljf-i'lisposed holes l-3 in whirh the operator eau insert a bar or the like to iaeilitate the turning ot the shank A. During the out ting operation it is necessary to rotate the collar l at intervals as the surface of the gasket seat m is out away7 by the entiers so as to leed the cutters into the work. .\t the completion ot the cutting operation the shank Ji oi" the tool is rerolred in the opA posite direetion so as to retract the eutters and thus enable the head ot the tool lo be withdrawn iroin the hand. hole.

lThen the tool is being used in the shop to torni the hand hole cover gasket seats on the inner side of a sectional boiler header gy, the head B ot the tool is inserted through one ol" the tube holes u in the rear wall of the header and moved downwardly so as to cause the cutting edges l0 ol the `cutters C to bear against the inner surface of the front wall ot said header and lorln a gasket seat in said surface surrounding the hand hole e in the front wall ot the header when the shank A ol the tool is rotated in one direc tion, said shank being conneeteifl to the spindle ot a drill or other machine for ineehani cally operatinnr the tool. After the hand hole cover g ret seats have lieen formed the header is turned upside-down so as to enable the tool to be used tor forming seats in the inner surface of the rear wall of' the header Ytor receiving the flanged ends ot the boiler tubes. lVhen the tool is being used in this way it is not necessary to use the bearing member D or collar E, due, ot course, to the fact that the boiler header on which the tool is operating is sustained by a work rest or support and the shank of the tool is connected to a drill spindle or the like which is aeiuaiiafl lo feed the Putters into the work.

Having thus descrita-.d my invention, what l claiin as new and desire to secure by liet ters Patent is:

l. tool for the purpose described, coinprising a shank, a head on said shank that is adapted to be inserted through a hand hole or tube hole in a boiler header or `water box, a plurality ot pirotally mounted Cutters on said head provided with parallel cutting edges disposed at substantially right angles to the longitudinal axis of the shank, and shoulders on said head against which said Cutters bear when the shank is revolved in a direction to Cause said cutters to act on the work.

2. A tool for the purpose described, comprising a shank.l a head on said shank, a pirotally mounted cutter on said head which swings outwardly into a position wherein the end portion ol saine projects beyond the head when the head is turned in one direc- Til tion, a rigid stop or abutment on the head that limits the outward movement of said cutter, and a resilient bufer on which the cutter bears when it is in its retracted position.

3. A tool for the purpose described, comprising a shank, a two-piece head on said shank, cutters pivotally mounted on. said head between the pieces of same that are adapted to move outwardly when the head is revolved in one direction, and shoulders on said head that limit the outward and inward movement of said cutters.

4. A tool for the urpose described, com- 15 prising a shank provlded with a portion that is adapted to be introduced into the hand hole of a boiler header or water box, pivotally mounted cutters on said portion that are rendered operative by rotary movement of the shank in one direction and rendered inoperative by rotary movement of said shank in the opposite direction, a bearing member on said shank that is adapted to engage the outer surface of the Wall in which the hand hole is formed, and means for moving said bearing member longitudinally of said shank in a direction to feed the cutters into the work.

SAMUEL B. CLAY. 

